Reversal of acute ischemic hypodense lesions on computed tomography

Hypodense ischemic lesions on computed tomography (CT) are usually associated with cerebral infarction and permanent tissue injury. We describe three cases of acute ischemic lesions detected by CT that rapidly resolved following therapy. In two cases, the appearance of hypodense lesions was associated with the onset of vasospasm after subarachnoid hemorrhage, and resolution correlated with successful treatment. In the third case, multiple acute hypodense lesions in a patient with eclampsia improved following treatment with diuretic agents.